How do communcations through ports works

Posted by user71866 on Server Fault See other posts from Server Fault or by user71866
Published on 2012-06-08T08:30:47Z Indexed on 2012/06/08 10:42 UTC
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port

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sockets

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socket

I was studying socket programming and certain questions came to my mind. These are some beginner level doubts

Is it mandatory to to use well known port for a particular application. For example if i am using ssl, can i design a server to listen on 1000 rather than 443.
For http we are connecting to port 80 from some other arbitrary port. Whys no port 80 to port 80 communcation.
how a server responds to connections coming to it from different ports to its port 80.
how many connections are possible to a particul

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